| MDR | Mitteldeutscher Rundfunk | In German | → Telecommunications |
| MDR | Mitteldeutsche Rundfunk (www.mdr.de) | In German | → Telecommunications |
| MetRu | Meteorologische Rundschau | In German | → Serial publications, periodicals → Meteorology, climatology |
| MetZe | Meteorologische Zeitschrift | In German | → Serial publications, periodicals → Meteorology, climatology |
| MFPA | Materialforschungs- und Prüfanstalt | In German | → Mathematics and natural sciences → 620 |
| MGWJ | Monatsschrift für Geschichte und Wissenschaft des Judentums | In German | → Serial publications, periodicals → Language, linguistics, literature → Geography, biography, history |
| MiARI | Astronomisches Rechen-Institut Heidelberg Mitteilungen | In German | → Serial publications, periodicals → Astronomy |
| MiGoe | Astronomische Mitteilungen der Universitäts-Sternwarte zu Göttingen | In German | → Serial publications, periodicals → Astronomy |
| MIO | Mitteilungen des Instituts für Orientforschung | In German | → Serial publications, periodicals → Language, linguistics, literature → Geography, biography, history |
| MiZur | Astronomische Mitteilungen der Eidgenössischen Sternwarte Zürich | In German | → Serial publications, periodicals → Astronomy |
| MLN | Mittelschullehrerverein Nidwalden | In German | → Organizations and associations → Education |
| MMW | Münchener Medizinische Wochenschrift | In German | → Serial publications, periodicals → Medicine |
| Mn | Mangan = Mn | Manganese | In French = Mn | Mangaan | In Estonian = Mn | منجنيز | In Arabic = Mn | Manqan | In Azerbaijani = Mn | Манган | In Bulgarian = Mn | Manganès | In Friulian = Mn | Μαγγάνιο | In Greek = Mn | Manganeso | In Spanish = Mn | Mangano | In Esperanto = Mn | منگنز | In Persian = Mn | Manganese | In English = Mn | Mangaan | In Afrikaans = Mn | Mangan | In Bosnian = Mn | Manganès | In Catalan = Mn | Mangan | In Danish |
In German | → Chemistry |
| MNPQ | Messen, Normen, Prüfen und Qualitätssicherung | In German | → Quality management → Engineering, technology |
| MoBiMed | Molekulare Bildgebung in der Medizin | In German | → Biological sciences → Medicine |
| MOFDV | Mittel- und Oberfränkischer Dartverband | In German | → Organizations and associations → Sport, physical exercises |
| MOG | Marktordnungsgesetz | In German | → Public administration, government |
| MotZe | Motortechnische Zeitschrift | In German | → Serial publications, periodicals → Mechanical engineering → Vehicle engineering |
| MPII | Max-Planck-Institut Informatik | In German | → Computer science |
| MPS | Max-Planck-Institut für Sonnensystemforschung (www.mps.mpg.de) | In German | → Research institutes → Solar system |
| MQ | MuseumsQuartier | In German | → Museums |
| MRT | Magnetresonanz-Tomografie = MRT | Magnetresonanstomografi | In Swedish |
In German | → Medicine → Nuclear, atomic, and molecular physics |
| MRZ | Medizinisches Rechenzentrum | In German | → Computer science → Medicine |
| MSOS | Mitteilungen des Seminars für Orientalische Sprachen | In German | → Serial publications, periodicals → Language, linguistics, literature |
| MSS | Münchener Studien zur Sprachwissenschaft | In German | → Serial publications, periodicals → Language, linguistics, literature |
| MST | Mikrosystemtechnik | In German | → Mechanical engineering → Electronics |
| MTR | Magnetresonanz-Tomografie | In German | → Mathematics and natural sciences → Applied sciences, technology |
| MUG | Medizinische Universität Graz | In German | → Higher education, universities → Medicine |
| MUT | Masterplan Umwelttechnologie | In German | → Nature |
| MUW | Medizinische Universität Wien | In German | → Higher education, universities → Medicine |
| MVMP | Methoden und Verfahren der Mathematischen Physik | In German | → Serial publications, periodicals → Mathematics → Physics |
| MVZ | Mittelschullehrerverband Zürich | In German | → Organizations and associations → Education → Higher education, universities |
| MwSt | Mehrwertsteuer = TVA | Taxe sur la Valeur Ajoutée | In French = BTW | Belasting op Toegevoegde Waarde | In Afrikaans = IVA | Impost sobre el valor afegit | In Catalan = PDV | Porez na dodatu vrijednost | In Bosnian = ДДС | Данъкът върху добавената стойност | In Bulgarian = VAT | Value Added Tax | In English = AVI | Aldonvalora imposto | In Esperanto = ΦΠΑ | Φόρος Προστιθέμενης Αξίας | In Greek = DPH | Daň z přidané hodnoty | In Czech = Moms | Meromsætningsafgift | In Danish = IVA | Impuesto al Valor Agregado | In Spanish = BTW | Belasting over de Toegevoegde Waarde | In Dutch = MVA | Merverdiavgift | In Norwegian = PVM | Pridėtinės vertės mokestis | In Lithuanian = IVA | Imposta sul Valore Aggiunto | In Italian = VASK | Virðisaukaskattur | In Icelandic = PPN | Pajak Pertambahan Nilai | In Indonesian = Áfa | Általános forgalmi adó | In Hungarian = PDV | Porez na dodanu vrijednost | In Croatian = ALV | Arvonlisävero | In Finnish = מע"מ | מס ערך מוסף | In Hebrew = KDV | Katma Değer Vergisi | In Turkish = VAT | ภาษีมูลค่าเพิ่ม | In Thai = VAT | மதிப்புக் கூட்டு வரி | In Tamil = DPH | Daň z pridanej hodnoty | In Slovak = НДС | Налог на добавленную стоимость | In Russian = TVA | Taxa pe valoarea adăugată | In Romanian = IVA | Imposto sobre o Valor Acrescentado | In Portuguese = VAT | 增值税 | In Chinese |
In German | → Taxes, duties |
| N | Stickstoff = N | Azote | In French = N | Stikstof | In Afrikaans = N | نيتروجين | In Arabic = N | Nitróxenu | In Asturian = N | Azot | In Azerbaijani = N | Азот | In Belarusian = N | Азот | In Bulgarian = N | নাইট্রোজেন | In Bengali = N | Dušik | In Bosnian = N | Nitrogen | In Catalan = N | Azotu | In Corsican = N | Dusík | In Czech = N | Азот | In Chuvash = N | Nitrogen | In Welsh = N | Kvælstof | In Danish = N | Άζωτο | In Greek = N | Nitrogen | In English = N | Azoto | In Esperanto = N | Nitrógeno | In Spanish = N | Lämmastik | In Estonian = N | Nitrogeno | In Basque = N | نیتروژن | In Persian = N | Typpi | In Finnish = N | Azôt | In Friulian = N | Nítrigin | In Irish = N | Nitróxeno | In Galician = N | નાઇટ્રોજન | GU = N | Neetragien | GV = N | חנקן | In Hebrew = N | नाइट्रोजन | In Hindi = N | Dušik | In Croatian = N | Azòt | HT = N | Nitrogén | In Hungarian = N | Ազոտ | In Armenian = N | Nitrogeno | In Interlingua = N | Nitrogen | In Indonesian = N | Nitro | In Ido = N | Nitur | In Icelandic = N | Azoto | In Italian = N | 窒素 | In Japanese = N | trano | JBO = N | აზოტი | In Georgian = N | 질소 | In Korean = N | Stickstoff | KSH = N | Nîtrojen | In Kurdish = N | Nitrogenium | In Latin = N | Stéckstoff | In Letzeburgesh = N | Stikstof | LI = N | Azoti | In Lingala = N | Azotas | In Lithuanian = N | Slāpeklis | In Latvian = N | Hauota | In Māori = N | Азот | In Macedonian = N | നൈട്രജന് | In Malayalam = N | Азот | In Mongolian = N | नायट्रोजन | MR = N | Ehēcatehuiltic | En Nahuatl = N | Stickstoff | NDS = N | Stikstof | In Dutch = N | Nitrogen | In Nynorsk = N | Nitrogen | In Norwegian = N | Nitrogene | NOV = N | Azòt | In Occitan = N | Nitrogen | PAM = N | Azot | In Polish = N | Nitrogénio | In Portuguese = N | Qullpachaq | In Quechua = N | Azot | In Romanian = N | Азот | In Russian = N | Azzotu | In Sicilian = N | Dušik | In Serbo-Croatian = N | Dusík | In Slovak = N | Dušik | In Slovenian = N | Azoti | SQ = N | Азот | In Serbian = N | Kväve | In Swedish = N | Nitrojeni | In Swahili = N | நைட்ரஜன் | In Tamil = N | నత్రజని | TE = N | Азот | In Tajik = N | ไนโตรเจน | In Thai = N | Azot | In Turkish = N | Азот | In Ukrainian = N | Azot | In Uzbek = N | Nitơ | In Vietnamese = N | 氮 | In Chinese |
In German | → Chemistry |
| N | Asparagin = N | Asparagine | In English = N | Asparagina | In Catalan = N | Asparagina | In Spanish = N | Asparagino | In Esperanto = N | Asparagine | In French = N | 아스파라긴 | In Japanese = N | Asparagin | In Indonesian = N | Asparagina | In Italian = N | אספרגין | In Hebrew = N | Asparagīns | In Latvian = N | Asparagin | In Letzeburgesh = N | Asparaginas | In Lithuanian = N | Asparagine | In Dutch = N | アスパラギン | In Japanese = N | Asparagina | In Polish = N | Asparagina | In Portuguese = N | Аспарагин | In Russian = N | Asparagín | In Slovak = N | Аспарагин | In Serbian = N | Asparagiini | In Finnish = N | Asparagin | In Swedish = N | Asparagin | In Turkish = N | Аспарагін | In Ukrainian = N | 天冬酰胺 | In Chinese |
In German | → Biochemistry, biophysics |
| Na | Natrium = Na | Sodium | In French = Na | Natrium | In Afrikaans = Na | صوديوم | In Arabic = Na | Sodiu | In Asturian = Na | Натрый | In Belarusian = Na | Натрий | In Bulgarian = Na | সোডিয়াম | In Bengali = Na | Natrijum | In Bosnian = Na | Sodi | In Catalan = Na | Sodiu | In Corsican = Na | Sodík | In Czech = Na | Sodiwm | In Welsh = Na | Natrium | In Danish = Na | ސޯޑިއަމް | DV = Na | Νάτριο | In Greek = Na | Sodium | In English = Na | Natrio | In Esperanto = Na | Sodio | In Spanish = Na | Naatrium | In Estonian = Na | Sodio | In Basque = Na | سدیم | In Persian = Na | Natrium | In Finnish = Na | Sodi | In Friulian = Na | Sóidiam | In Irish = Na | Sodio | In Galician = Na | Sodjum | GV = Na | נתרן | In Hebrew = Na | सोडियम | In Hindi = Na | Natrij | In Croatian = Na | Sodyòm | HT = Na | Nátrium | In Hungarian = Na | Նատրիում | In Armenian = Na | Natrium | In Indonesian = Na | Natro | In Ido = Na | Natrín | In Icelandic = Na | Sodio | In Italian = Na | ナトリウム | In Japanese = Na | sodna | JBO = Na | Natrium | JV = Na | ნატრიუმი | In Georgian = Na | ಸೋಡಿಯಮ್ | KN = Na | 나트륨 | In Korean = Na | Natrîyûm | In Kurdish = Na | Natrium | In Latin = Na | Natrium | In Letzeburgesh = Na | Sodu | In Lingala = Na | Natris | In Lithuanian = Na | Nātrijs | In Latvian = Na | Konutai | In Māori = Na | Натриум | In Macedonian = Na | സോഡിയം | In Malayalam = Na | सोडियम | MR = Na | Natrium | NDS = Na | Natrium | In Dutch = Na | Natrium | In Nynorsk = Na | Natrium | In Norwegian = Na | Natrium | NOV = Na | Sôdgium | In Norman = Na | Sòdi | In Occitan = Na | Sód | In Polish = Na | Sódio | In Portuguese = Na | Natriyu | In Quechua = Na | Sodiu | In Romanian = Na | Натрий | In Russian = Na | Sodiu | In Sicilian = Na | Natrij | In Serbo-Croatian = Na | Sodík | In Slovak = Na | Natrij | In Slovenian = Na | Natriumi | SQ = Na | Натријум | In Serbian = Na | Natrium | In Swedish = Na | Natiri | In Swahili = Na | சோடியம் | In Tamil = Na | సోడియమ్ | TE = Na | Натрий | In Tajik = Na | โซเดียม | In Thai = Na | Sodyum | In Turkish = Na | Натрій | In Ukrainian = Na | Natriy | In Uzbek = Na | Natri | In Vietnamese = Na | Sodiom | In Walloon = Na | 钠 | In Chinese |
In German | → Chemistry |
| NacEl | Nachrichten Elektronik | In German | → Serial publications, periodicals → Electronics |
| NacZe | Nachrichtentechnische Zeitschrift | In German | → Serial publications, periodicals → Applied sciences, technology |
| NASH | Nicht-alkoholische Steatohepatitis | In German | → Pathology |
| NATO | Nordatlantikvertrag-Organisation (www.nato.int) = OTAN | Organització del Tractat de l'Atlàntic Nord | In Catalan = NATO | North Atlantic Treaty Organisation | In English = OTAN | Organizazión d'o Tratau de l'Atlantico Norte | In Aragonese = OTAN | Organización del Tratáu del Atlánticu Norte | In Asturian = AFNA | Aozadur Feur-emglev Norzh-Atlantel | In Breton = OTAN | Organisation du Traité de l'Atlantique Nord | In French = ন্যাটো | উত্তর আটলান্টিক নিরাপত্তা জোট | In Bengali = NATO | Οργανισμός Βορειοατλαντικού Συμφώνου | In Greek = OTAN | Organización del Tratado del Atlántico Norte | In Spanish = NATO | Nord-Atlantika Traktat-Organizo | In Esperanto = NAFO | Noard-Atlantyske Ferdrachsorganisaasje | In Frisian = OTAN | Organización do Tratado do Atlántico Norte | In Galician = ნატო | ჩრდილოატლანტიკური თანამშრომლობის ორგანიზაცია | In Georgian = OTAN | Organização do Tratado do Atlântico Norte | In Portuguese = OTNA | Organizaciya le Tratatosko le Nordutne Atlantikosko | In Vlax Romani = OTAN | Organizaţia Tratatului Atlanticului de Nord | In Romanian = NATO | Organisatschoon vun den Noordatlantikverdrag | NDS |
In German | → International relations |
| NAWG | Nachrichten der Akademie der Wissenschaften in Göttingen | In German | → Serial publications, periodicals |
| NAZ | Nachrichtenblatt der Astronomischen Zentralstelle Heidelberg | In German | → Serial publications, periodicals → Astronomy |
| NCG | Nicolaus Cusanus Gymnasium | In German | → Education |
| NDÖ | Notfallpsychologische Dienst Österreich | In German | → Psychology |
| NDR | Norddeutscher Rundfunk | In German | → Telecommunications |
| NDV | Niedersächsischer Dartverband | In German | → Organizations and associations → Sport, physical exercises |
| NEMO | Netzwerkmanagement-Ost | In German | → Research policy |
| NETWEIs | New and Emerging Technologies - Wege zur Erkennung und Implementierung für KMUs | In German | → Research policy → Engineering, technology |
| NFN | Nationales Forschungsnetzwerk | In German | → Research policy |
| NFÖ | Neutrales Freies Österreich | In German | |
| NGFAW | Nachrichtentechnische Gesellschaft Fachtagung über Antennen | In German | → Serial publications, periodicals → Telecommunications |
| NGO | Nichtregierungsorganisation = ONGs | Organizações Não Governamentais | In Portuguese = NGO | Non-Governmental Organization | In English = ANG | Aozadur Nann-Gouarnamantel | In Breton = ONG | Organisation Non Gouvernementale | In French = NRO | Ne-Registara Organizo | In Esperanto = ONG | Organizzazione non governativa | In Italian = LSM | Lembaga Swadaya Masyarakat | In Indonesian = ONG | Organización non gobernamental | In Galician = GKE | Gobernuz Kanpoko Erakunde | In Basque = ONG | Organización no gubernamental | In Spanish = ΜΚΟ | Μη κυβερνητικές οργανώσεις | In Greek = NNO | Nevládní nezisková organizace | In Czech = ONG | Organització no governamental | In Catalan = ННО | Неурядові неприбуткові організації | In Ukrainian = ONG | Organização não governamental | In Portuguese = NGO | Niet-gouvernementele organisatie | In Dutch = NVO | Nevyriausybinė organizacija | In Lithuanian |
In German | → Organizations and associations |
| NIRS | Nahinfrarot-Spektroskopie | In German | → Physics |
| NJKA | Neues Jahrbuch für der klassischen Altertum | In German | → Serial publications, periodicals |
| NJMM | Neues Jahrbuch Mineralogie Monatshefte | In German | → Serial publications, periodicals → Mineralogy |
| NN | Nacht und Nebel | In German | → History |
| NÖ | Niederösterreich | In German | → Geography |
| NOAG | Nachrichten der Gesellschaft für Natur- und Völkerkunde Ostasiens | In German | → Serial publications, periodicals → Ethnology → Area studies |
| NÖGKK | Niederösterreichische Gebietskrankenkasse | In German | |
| NÖGUS | Niederösterreichischer Gesundheits- und Sozialfonds | In German | |
| NÖN | Niederösterreichische Nachrichten | In German | → Newspapers, journalism |
| NÖWSVF | Niederösterreichs Wirtschaftsförderungs- und Strukturverbesserungsfonds | In German | → Economics |
| NQR | Nationaler Qualifikationsrahmen | In German | → Education |
| NRhWB | Rheinisches Wörterbuch Nachträge | In German | → Dictionaries → Linguistics |
| NRW | Nordrhein-Westfalen | In German | → Geography |
| NTA | Netzwerk Technikfolgenabschätzung | In German | → Organizations and associations → Applied sciences, technology |
| NU | Naresuan-Universität = NU | Naresuan University | In English |
In German | → Higher education, universities |
| NUA | Niederösterreichische Umweltschutzanstalt | In German | → Nature → Environment, environmental sciences |
| NVS | Nachrichtenblatt der Vereinigung der Sternfreunde | In German | → Serial publications, periodicals → Astronomy |
| NW | Naturwissenschaften | In German | → Serial publications, periodicals → Mathematics and natural sciences |
| NWDV | Nordrhein-Westfälischer Dartverband | In German | → Organizations and associations → Sport, physical exercises |
| NWS | Neckarwerke Stuttgart AG | In German | → Energy economics |
| O | Sauerstoff = O | Oxygène | In French = O | Suurstof | In Afrikaans = O | Sauerstoff | ALS = O | أكسجين | In Arabic = O | Oxíxenu | In Asturian = O | Oksigen | In Azerbaijani = O | Sauastoff | BAR = O | Кісларод | In Belarusian = O | Кислород | In Bulgarian = O | অক্সিজেন | In Bengali = O | Oksigen | In Breton = O | Kiseonik | In Bosnian = O | Oxigen | In Catalan = O | Ossigenu | In Corsican = O | Kyslík | In Czech = O | Йӳçлĕк | In Chuvash = O | Ocsigen | In Welsh = O | Ilt | In Danish = O | Οξυγόνο | In Greek = O | Oxygen | In English = O | Oksigeno | In Esperanto = O | Oxígeno | In Spanish = O | Hapnik | In Estonian = O | Oxigeno | In Basque = O | اکسیژن | In Persian = O | Happi | In Finnish = O | Ossigjen | In Friulian = O | Soerstof | In Frisian = O | Ocsaigin | In Irish = O | Àile-beatha | GD = O | Osíxeno | In Galician = O | ઑક્સીજન | GU = O | Ocsygien | GV = O | חמצן | In Hebrew = O | आक्सीजन | In Hindi = O | Kisik | In Croatian = O | Kislik | HSB = O | Oksijèn | HT = O | Oxigén | In Hungarian = O | Թթվածին | In Armenian = O | Oxygeno | In Interlingua = O | Oksigen | In Indonesian = O | Oxo | In Ido = O | Súrefni | In Icelandic = O | Ossigeno | In Italian = O | 酸素 | In Japanese = O | kijno | JBO = O | Oksigen | JV = O | ჟანგბადი | In Georgian = O | ಆಮ್ಲಜನಕ | KN = O | 산소 | In Korean = O | Sauerstoff | KSH = O | Oksîjen | In Kurdish = O | Oxygenium | In Latin = O | Sauerstoff | In Letzeburgesh = O | Zuurstof | LI = O | Oksijɛ́ní | In Lingala = O | Deguonis | In Lithuanian = O | Skābeklis | In Latvian = O | Hāora | In Māori = O | Кислород | In Macedonian = O | ഓക്സിജന് | In Malayalam = O | Хүчилтөрөгч | In Mongolian = O | ऑक्सिजन | MR = O | Oksigen | In Malay = O | Ehēcayoh | En Nahuatl = O | Suerstoff | NDS = O | अक्सिजन | NEW = O | Zuurstof | In Dutch = O | Oksygen | In Nynorsk = O | Oksygen | In Norwegian = O | Oxygen | OM = O | Oxygen | PAM = O | Tlen | In Polish = O | Oxigénio | In Portuguese = O | Muksichaq | In Quechua = O | Oxigen | In Romanian = O | Кислород | In Russian = O | Ossìgginu | In Sicilian = O | Kiseonik | In Serbo-Croatian = O | ඔක්සිජන් | SI = O | Kyslík | In Slovak = O | Kisik | In Slovenian = O | Oksigjeni | SQ = O | Кисеоник | In Serbian = O | Oksigén | SU = O | Syre | In Swedish = O | Oksijeni | In Swahili = O | ஆக்ஸிஜன் | In Tamil = O | ఆక్సిజన్ | TE = O | Оксиген | In Tajik = O | ออกซิเจน | In Thai = O | Oksiheno | In Tagalog = O | Oksijen | In Turkish = O | Кисень | In Ukrainian = O | Kislorod | In Uzbek = O | Ôxy | In Vietnamese = O | זויערשטאף | In Yiddisch = O | 氧 | In Chinese |
In German | → Chemistry |
| ÖAD | Österreichischer Austauschdienst | In German | |
| ÖÄGM | Österreichische Ärztegesellschaft für Manuelle Medizin | In German | → Organizations and associations → Medicine |
| ÖAI | Österreichisches Archäologisches Institut | In German | |
| ÖÄK | Österreichische Ärztekammer | In German | → Medicine |
| ÖAMTC | Österreichischer Automobil-, Motorrad- und Touring Club | In German | → Organizations and associations → Vehicle engineering → Transport and postal services |
| ÖAR | Österreichische Arbeitsgemeinschaft für Rehabilitation | In German | → Associations |
| ÖAW | Österreichische Akademie der Wissenschaften | In German | → Academies → Mathematics and natural sciences |
| OBDV | Oberbayerischer Dartverband | In German | → Organizations and associations → Sport, physical exercises |
| ÖBFA | Österreichische Bundesfinanzierungsagentur (www.oebfa.co.at) | In German | → Central administration → Finance |
| ÖBIG | Österreichisches Bundesinstitut für Gesundheitswesen | In German | |
| ÖBR | Österreichische Buddhistische Religionsgesellschaft (www.buddhismus-austria.at) | In German | → Organizations and associations → Buddhism |
| ÖBV | Österreichische Beamtenversicherung | In German | → Labour, labour economics → Insurance |
| OBVP | Österreichischer Bundesverband für Psychotherapie (www.psychotherapie.at) | In German | → Organizations and associations → Psychology → Neurology |
| ÖCG | Österreichische Computer Gesellschaft (www.ocg.at) | In German | → Organizations and associations → Computer science |
| ÖCI | Österreichisches Controller-Institut (www.oeci.at) | In German | |
| ÖDG | Österreichische Diabetes-Gesellschaft | In German | → Organizations and associations → Pathology |
| ÖDOZA | Österreichisches Dokumentationszentrum für Auslandsstudien | In German | → Libraries → Education |
| OeAV | Österreichischer Alpenverein (www.alpenverein.at) | In German | → Organizations and associations |
| OEGGG | Österreichische Gesellschaft für Gynäkologie und Geburtshilfe (www.oeggg.at) | In German | → Organizations and associations → Gynaecology → Obstetrics |
| ÖEK | Österreichisches Elektrotechnisches Komitee | In German | |
| OeM | Österreichische Mediathek | In German | → Libraries |
| OEW | Oberschwäbische Elektrizitätswerke | In German | → Electrical engineering |
| OEZA | Österreichische Entwicklungs- und Ostzusammenarbeit | In German | → International relations |
| ÖFAI | Österreichisches Forschungsinstitut für Artificial Intelligence (www.ofai.at) | In German | → Research institutes → Artificial intelligence |
| OFFL | Odd-Fellows Frauen Loge | In German | → Religion, theology |
| ÖFG | Österreichische Forschungsgemeinschaft | In German | → Research policy → Mathematics and natural sciences → Applied sciences, technology |
| OFI | Österreichisches Forschungsinstitut für Chemie und Technik | In German | |
| ÖFSE | Österreichische Forschungsstiftung für Entwicklungshilfe | In German | → Foundations → Development |
| ÖFV | Österreichisch-Französische Vereinigung (www.oefv.org) | In German | → Organizations and associations → International relations |
| ÖFZ | Österreichisch-Französisches Zentrum für wirtschaftliche Annäherung in Europa | In German | → Economics |
| ÖGA | Österreichische Gesellschaft für Außenpolitik und Internationale Beziehungen | In German | |
| ÖGA | Österreichische Gesellschaft für Akupunktur | In German | → Medicine |
| ÖGAA | Österreichische Gesellschaft für Astronomie und Astrophysik (www.oegaa.at) | In German | → Organizations and associations → Astronomy |
| ÖGAA | Österreichische Gesellschaft für Astronomie und Astrophysik (www.oegaa.at) | In German | → Organizations and associations → Astronomy |
| ÖGAI | Österreichische Gesellschaft für Allergologie und Immunologie | In German | → Organizations and associations → Immunology and allergy |
| ÖGAM | Österreichische Gesellschaft für Allgemeinmedizin | In German | → Organizations and associations → Medicine |
| ÖGAM | Österreichische Gesellschaft für Allgemein- und Familienmedizin | In German | |
| ÖGARI | Österreichische Gesellschaft für Anaesthesiologie, Reanimation und Intensivmedizin | In German | → Organizations and associations → Traumatology → Anesthesiology |
| ÖGB | Österreichischer Gewerkschaftsbund | In German | → Organizations and associations → Labour, labour economics |
| ÖGB | Österreichische Gewerkschaftsbund | In German | → Organizations and associations → Labour, labour economics |
| ÖGBM | Österreichische Gesellschaft für Biochemie und Molekularbiologie | In German | |
| ÖGBT | Österreichische Gesellschaft für Biotechnologie | In German | |
| ÖGDV | Österreichische Gesellschaft für Dermatologie und Venerologie | In German | → Organizations and associations → Dermatology |
| ÖGfL | Österreichische Gesellschaft für Literatur | In German | |
| ÖGGG | Österreichische Gesellschaft für Geriatrie und Gerontologie | In German | → Organizations and associations → Gerontology |
| ÖGGGT | Österreichische Gesellschaft für Genetik und Gentechnologie | In German | |
| ÖGGH | Österreichische Gesellschaft für Gastroenterologie und Hepatologie | In German | → Organizations and associations → Pathology |
| ÖGHMP | Österreichische Gesellschaft für Hygiene, Mikrobiologie und Präventivmedizin | In German | |
| ÖGHO | Österreichische Gesellschaft für Hämatologie und Onkologie | In German | → Organizations and associations → Oncology |
| ÖGI | Österreichisches Getränke-Institut | In German | → Research institutes → Beverage industry |
| ÖGI | Österreichisches Gießerei-Institut | In German | → Research institutes → Metallurgy |
| ÖGIG | Österreichische Gesellschaft für Informatikgeschichte | In German | → Computer science → History |
| ÖGIM | Österreichische Gesellschaft für Innere Medizin | In German | → Organizations and associations → Medicine |
| ÖGK | Österreichisches Grünes Kreuz (www.gruenes-kreuz.org) | In German | → Organizations and associations → Medicine |
| OGKA | Österreichische Gesellschaft für kontrollierte Akupunktur | In German | → Organizations and associations → Medicine |
| ÖGKC | Österreichische Gesellschaft für klinische Chemie | In German | → Organizations and associations → Biochemistry, biophysics → Pharmacology, toxicology |
| ÖGKJ | Österreichische Gesellschaft für Kinder- und Jugendheilkunde (www.docs4you.at) | In German | → Organizations and associations → Pediatry |
| ÖGLUT | Österreichische Gesellschaft für Lungenerkrankungen und Tuberkulose | In German | → Organizations and associations → Chest diseases → Infectious diseases |
| ÖGN | Österreichische Gesellschaft für Neurologie | In German | → Organizations and associations → Neurology |
| ÖGN | Österreichische Gesellschaft für Nuklearmedizin | In German | → Organizations and associations → Medicine |
| ÖGP | Österreichische Gesellschaft für Pneumologie | In German | → Organizations and associations → Chest diseases |
| ÖGPB | Österreichische Gesellschaft für Neuropsychopharmakologie und Biologische Psychiatrie | In German | → Organizations and associations → Pharmacology, toxicology → Neurology → Psychiatry |
| ÖGPH | Österreichische Gesellschaft für Public Health | In German | → Organizations and associations → Medicine |
| ÖGPMR | Österreichische Gesellschaft für Physikalische Medizin und Rehabilitation | In German | → Organizations and associations → Medicine |
| ÖGPPM | Österreichische Gesellschaft für Psychosomatische und Psychotherapeutische Medizin | In German | |
| ÖGRME | Österreichische Gesellschaft für Reproduktionsmedizin und Endokrinologie | In German | → Organizations and associations → Gynaecology |
| ÖGRO | Österreichische Gesellschaft für Radioonkologie | In German | |
| ÖGS | Österreichische Gesellschaft für Senologie | In German | → Organizations and associations → Medicine |
| ÖGSMSF | Österreichische Gesellschaft für Schlafmedizin und Schlafforschung | In German | → Organizations and associations → Medicine |
| ÖGT | Österreichische Gesellschaft für Tuina | In German | → Medicine |
| ÖGUM | Österreichische Gesellschaft für Ultraschall in der Medizin | In German | → Organizations and associations → Medicine |
| ÖGUT | Österreichische Gesellschaft für Umwelt und Technik | In German | |
| ÖGV | Österreichischer Gewerbeverein | In German | → Economics |
| ÖH | Österreichische Hochschülerschaft | In German | |
| ÖHT | Österreichische Hotel- und Tourismusbank (www.oeht.at) | In German | → Financial markets → Tourism |
| ÖIAG | Österreichische Industrieholding Aktiengesellschaft | In German | |
| ÖIAT | Österreichisches Institut für angewandte Telekommunikation | In German | → Research institutes → Telecommunications |
| OIB | Österreichisches Institut für Bautechnik | In German | → Building |
| ÖIE | Österreichischer Informationsdienst für Entwicklungspolitik | In German | |
| ÖIIP | Österreichisches Institut für Internationale Politik | In German | |
| ÖIJ | Österreichisches Institut für Jugendforschung | In German | → Social sciences |
| ÖIN | Österreichisches Institut für Nachhaltige Entwicklung | In German | |
| ÖK | Österreich Kooperation | In German | |
| ÖKB | Österreichische Kontrollbank | In German | → Banks |
| ÖKG | Österreichische Kardiologische Gesellschaft | In German | → Organizations and associations → Cardiology |
| ÖKISTA | Österreichisches Komitee für Internationalen Studentenaustausch | In German | → Organizations and associations → International relations → Higher education, universities |
| ÖKU | Österreichisches Komitee für Unfallverhütung im Kindesalter | In German | |
| OLZ | Orientalistische Literaturzeitung | In German | |
| ÖMCCV | Österreichische Morbus Crohn-Colitis ulcerosa Vereinigung | In German | → Pathology |
| OMT | Oberflächen- und Materialtechnologie GmbH | In German | → 620 |
| ON | Österreichisches Normungsinstitut | In German | → Standardization |
| ÖNRAP | Österreichisches nationales Radonprojekt | In German | |
| OÖ | Oberösterreich | In German | → Geography |
| ÖOG | Österreichische Orient-Gesellschaft Hammer-Purgstall | In German | |
| OÖGKK | Oberösterreichische Gebietskrankenkassa | In German | |
| ÖPG | Österreichische Physikalische Gesellschaft | In German | → Organizations and associations → Physics |
| OPG | Osteoprotegrin | In German | → Biochemistry, biophysics |
| ORF | Österreichischer Rundfunk | In German | → Telecommunications |
| ORF | Österreichische Rundfunk (http://orf.at) | In German | → Telecommunications |
| ÖRG | Österreichische Röntgengesellschaft | In German | → Organizations and associations → Medicine |
| ÖRK | Österreichische Rektorenkonferenz | In German | |
| OrNav | Ortung und Navigation | In German | → Serial publications, periodicals → Geodesy, cartography |
| ÖROK | Österreichische Raumordnungskonferenz | In German | |
| ÖRPE | Österreichische Referenzzentrum zur Erfassung und Dokumentation von menschlichen Prionenerkrankungen | In German | → Pathology |
| ORS | Österreichische Rundfunksender (www.ors.at) | In German | → Telecommunications |
| ÖRV | Österreichischer Rodel-Verband (www.rodel-austria.at) | In German | → Organizations and associations |
| OSB | Oberste Schifffahrtsbehörde | In German | |
| ÖSFK | Österreichisches Studienzentrum für Frieden und Konfliktlösung | In German | → Research institutes → Polemology |
| ÖSFO | Ökosoziales Forum Österreich | In German | → Organizations and associations → Social sciences |
| ÖSG | Österreichische Schmerzgesellschaft | In German | → Organizations and associations → Pathology |
| ÖSG | Österreichischer Strukturplan Gesundheit | In German | |
| OSI | Österreichisches Ost- und Südosteuropa-Institut (www.osi.ac.at) | In German | → Research institutes → Area studies |
| OSI | Otto-Suhr-Institut für Politikwissenschaft | In German | → Politics |
| OSI | (Österreichisches) Ost- und Südosteuropa-Institut | In German | → Research institutes → Area studies |
| OSPG | Österreichisch-Südpazifische Gesellschaft | In German | → Organizations and associations |
| OSR | Oberster Sanitätsrat | In German | → Organizations and associations → Public health and hygiene |
| ÖTI | Österreichisches Textil-Forschungsinstitut | In German | → Research institutes → Textile industry |
| ÖTK | Österreichischer Touristenklub | In German | → Tourism |
| OTS | Originaltext-Service | In German | → Newspapers, journalism |
| ÖUK | Österreichische UNESCO-Kommission | In German | |
| ÖVA | Osterreichischer Verein für Altlastenmanagement | In German | → Nature → Environment, environmental sciences |
| ÖVE | Österreichischer Verband für Elektrotechnik | In German | |
| ÖVG | Österreichische Verkehrswissenschaftlichen Gesellschaft | In German | → Transport and postal services |
| ÖVI | Österreichischer Verband der Immobilientreuhänder | In German | → Organizations and associations → Accommodation |
| ÖVK | Österreichischer Verein für Kraftfahrzeugtechnik (www.?vk.at) | In German | → Organizations and associations → Mechanical engineering |
| ÖVN | Österreichischer Verein für Navigation = AIN | Austrian Institute of Navigation | In English |
In German | → Geodesy, cartography → Vehicle engineering → Transport and postal services |
| ÖWA | Österreichische Webanalyse | In German |